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phthal'ic ac'id




1. Chem.any of three isomeric acids having the formula C8H6O4, esp. the ortho isomer (orthophthalic acid), a colorless, crystalline, slightly water-soluble solid used chiefly in the manufacture of dyes, medicine, and perfume.
2. See isophthalic acid.
3. See terephthalic acid.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

phthalicphthalic anhydride
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